<pre class="shiki github-dark shaku"><code>/** * @param {any} data * @return {string} */function detectType(data) { const type = typeof data; if(data === null) return 'null'; if(Array.isArray(data)) return 'array'; if(data instanceof Map) return 'map'; if(data instanceof Set) return 'set'; if(data instanceof Date) return 'date'; if(data instanceof ArrayBuffer) return 'arraybuffer'; if(type === "object") { return typeof data.valueOf() } return type;}</code></pre>

Doing in hard way

This is an easy problem. For all the basic data types in JavaScript, how could you write a function to detect the type of arbitrary data? Besides basi…